CN102721948A - Large-scene SAR deception jamming implementation method - Google Patents

Large-scene SAR deception jamming implementation method Download PDF

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CN102721948A
CN102721948A CN2012102340174A CN201210234017A CN102721948A CN 102721948 A CN102721948 A CN 102721948A CN 2012102340174 A CN2012102340174 A CN 2012102340174A CN 201210234017 A CN201210234017 A CN 201210234017A CN 102721948 A CN102721948 A CN 102721948A
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signal
scene
distance
radar
time
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周峰
白雪茹
赵博
石晓然
孙光才
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Xidian University
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Xidian University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/38—Jamming means, e.g. producing false echoes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques

Abstract

The invention discloses a large-scene SAR (Synthetic Aperture Radar) deception jamming implementation method. The method comprises the following steps: (1) a jammer intercepts a radar signal; (2) performing partitioning treatment on a false large-scene image; (3) modulating an intercepted signal; (4) generating a deception jamming signal; and (5) forwarding the deception jamming signal. The large-scene SAR deception jamming implementation method is suitable for implementing quick and real-time deception jamming of a large-scene SAR; the deception jamming method is given into full play to adjust the false scene focusing center to the scene center, so that the image can be well focused in the SAR system of the opposite side, and the jamming deception is improved; the orientation defocusing condition of the depth of focus and the Nyquist sampling law are utilized to determine the applicable range, so that the implementation method provided by the invention has good feasibility; and the real-time performance of the deception jamming is improved through partitioning parallel modulation of large-scene images.

Description

A kind of large scene SAR cheating interference implementation method
Technical field
The invention belongs to the signal processing technology field, further relate to the large scene SAR cheating interference implementation method in the radar signal processing field.The cheating interference of synthetic-aperture radar SAR through real-time large scene, the present invention can obtain focusing effect preferably in the other side's synthetic aperture radar image-forming system, thereby realizes the effective cheating interference to synthetic-aperture radar.
Background technology
The perturbation technique of SAR can be divided into the interference of compacting formula and the deception formula is disturbed.Compacting formula interference principle is simple relatively, but requires very high to jamming power.It then is to obtain on the basis of key parameters such as centre frequency, frequency modulation rate, bandwidth of enemy SAR signal in scouting that the deception formula is disturbed; Through modes such as guinea pig echo or echo forwardings the SAR system is disturbed; Though interference principle relative complex and interference effect depend on the precision of reconnaissance system to a great extent, the requirement of jammer power is just greatly reduced.SAR deception formula is disturbed in the echoed signal that makes enemy SAR system obtain and is comprised deception information, occurs the false scene of disturbing in the imaging results thereby make, and reaches interference effect of " mixing the spurious with the genuine " and the tactical purpose that real goal is hidden, protected.
Luo Shen; Li Dongsheng is in document " a kind of SAR cheating interference method research of data multiplex " (aerospace electron antagonism; The 26th the 3rd phase of volume, 2010) in a kind of cheating interference signal generating structure of pipeline organization has been proposed, this method is according to SAR ground return model and SAR active cheating interference model; Analyzed the influence of SAR carrier platform motion to the path delay inequality; Through can be used for generating the system responses function of different azimuth to the decoy signal of position, it is multiplexing to utilize pipeline organization that operation result is carried out, thereby generates the signal of more decoy point.But the deficiency of this method is, because the instability of the machine of carrying motion have kinematic error in the gained signal, and the recycling of data greatly reduces the real-time of cheating interference.
Sun Guangcai; Zhou Feng, punishment Meng Dao protects polished at document " false scene SAR deception formula perturbation technique and real-time analysis " (Xian Electronics Science and Technology University's journal; The 36th the 5th phase of volume; 2009) in the real-time method that a kind of false scene synthetic-aperture radar deception formula is disturbed has been proposed, this method is at first carried out image to false scene image through fast algorithm and is generated processing in advance, carries out convolution to pregenerated Vitua limage and the received synthetic-aperture radar signal of jammer then; And carry out live signal and transmit, make the other side's radar after handling, obtain the false scene of deception formula through motion compensation and synthetic aperture radar image-forming.But the deficiency of this method is, only can access focusedimage preferably within the specific limits, when false scene objects departs from jammer when far away, is false scene when bigger, and the cheating interference image imaging is the result can defocus.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, propose a kind of large scene SAR cheating interference implementation method.The present invention has remedied the fraudulent reduction of interference that the recycling that has kinematic error and data in the data multiplex cheating interference method causes; In the false scene SAR deception formula perturbation technique false scene objects depart from jammer when far away imaging results defocus, in the time of seriously even can not form images.And large scene SAR cheating interference implementation method involved in the present invention makes full use of the adjustment of the false scene of cheating interference focusing center and makes image focusing good; And through analyzing the condition of the depth of focus, nyquist sampling law; The scope of application to this method is inquired into, and adopts the block parallel disposal route to improve the real-time and the duplicity of cheating interference.
Realize that basic ideas of the present invention are: the signal that the radar signal of jammer intercepting and capturing is obtained scene objects point through delay; Again large scene being carried out block parallel handles; Estimate the scene center of each subimage module; Through adjustment scene focusing center position to the subimage radar signal respectively distance to the orientation to modulating; Signal after will modulating again and the stack of original radar signal obtain the cheating interference signal, and transmit, and make the other side's polarization sensitive synthetic aperture radar system obtain focusing on good SAR image.
For realizing above-mentioned purpose, the present invention includes following steps:
A kind of large scene SAR cheating interference implementation method may further comprise the steps:
(1) jammer is intercepted and captured radar signal
1a) jammer is intercepted and captured the radar time-domain signal, and with the radar time-domain signal of intercepting and capturing in distance to making Fourier transform, obtain the distance by radar frequency-region signal;
1b) the radar time-domain signal is made delay process, obtain radar time domain time delayed signal;
(2) false large scene image being carried out piecemeal handles
2a) confirm distance to the piecemeal element length to the condition that do not defocus according to the orientation of the depth of focus, with false large scene image distance to total length divided by distance to the piecemeal element length, obtain apart to the piecemeal number;
2b) confirm the orientation to the piecemeal element length according to the nyquist sampling law, with the large scene image orientation to total length divided by the orientation to the piecemeal element length, obtain the orientation to the piecemeal number;
2c) the large scene image is divided into M * N piece subimage, wherein, M be the distance to the piecemeal number, N is that the orientation is to the piecemeal number;
2d) geometric center of each subimage is set to focusing center separately, with the focusing center of each subimage as separately scene center;
(3) modulation intercepted signal
3a) with step 1b) in radar time domain time delayed signal the distance to making Fourier transform, obtain the frequency-region signal of false scene objects point;
3b) in the frequency-region signal with false scene objects point, change the part that is determined by the instantaneous oblique distance between the amplitude of false scene image and false scene and the radar and be defined as the frequency domain modulation coefficient;
3c) subimage frequency domain modulation coefficient is divided into generation part in advance and generates part in real time;
3d) will generate in advance part at the enterprising row distance of same localizer unit to stack, the index of modulation that obtains after the distance stack generates part in advance;
3e) different localizer units is generated in real time after part and the distance stack the index of modulation in advance the generating unit branch multiply each other, and in the orientation to superposeing, obtain the index of modulation of subimage;
3f) to each subimage while execution in step 3c), step 3d), step 3e) and carry out parallel computation, obtain the index of modulation of all subimages;
3g) with the index of modulation of all subimages add with, obtain coefficient after the frequency domain modulation;
3h) with coefficient after the frequency domain modulation and step 1a) in the distance by radar frequency-region signal that obtains multiply each other, obtain modulating the back apart from frequency-region signal;
(4) generate the cheating interference signal
To modulate the back apart from frequency-region signal the distance to making inverse Fourier transform, obtain time domain cheating interference signal;
(5) transmit the cheating interference signal
With the cheating interference signal forwarding, the other side's radar obtains the cheating interference signal of real scene radar signal and the stack of time domain cheating interference signal.
The present invention compared with prior art has the following advantages:
First; The present invention has adopted the large scene interfering picture has been carried out block parallel modulation, has overcome data multiplex in the prior art data multiplex cheating interference method and has caused the deficiency of disturbing duplicity to reduce, makes the present invention have to realize simple; Efficient is high, the advantage that real-time is high.
Second; The restrictive condition that the present invention has adopted depth of focus orientation not defocus condition and nyquist sampling law is confirmed the scope of application of this method; Overcome the prior art image deficiency that can better focus within the specific limits only in the cheating interference algorithm in real time fast, made the realization of the present invention to have better feasibility.
The 3rd; The present invention has adopted the method for adjustment scene center position; Overcome in the prior art fast in real time in the cheating interference algorithm false scene objects depart from jammer when far away imaging defocus serious deficiency; Make the present invention had can be in the other side's synthetic aperture radar image-forming system well focussed, realize to synthetic-aperture radar in real time, the effective advantage of deception.
Description of drawings
Fig. 1 is a process flow diagram of the present invention;
Fig. 2 is simulated effect figure of the present invention.
Embodiment
Do below in conjunction with 1 pair of step of the present invention of accompanying drawing and to describe in further detail.
Step 1: jammer is intercepted and captured radar signal
Jammer is intercepted and captured the radar time-domain signal, and obtaining with the distance is that the row vector is the radar signal data of column vector with the orientation, and the radar time-domain signal of intercepting and capturing apart to making Fourier transform, is obtained the distance by radar frequency-region signal; The radar time-domain signal is delayed time
Figure BSA00000745105900041
Individual time quantum, wherein, Δ R mFor scene objects point m and jammer to the range difference that carries machine platform, c is the light velocity, obtains radar time domain time delayed signal:
s ′ ( t ^ , t m ) = s ( t ^ , t m ) ⊗ σ ( x , y ) δ ( t - 2 ΔR ( t m ) c )
Wherein, Be scene objects point signal,
Figure BSA00000745105900044
Be fast time, t mBe the slow time,
Figure BSA00000745105900045
Be the radar signal of jammer intercepting and capturing,
Figure BSA00000745105900046
Be the convolution symbol, σ (x y) is the reflection coefficient of false scene point, (x y) is scene objects point position, and δ (t) is an impulse function, Be full-time, Δ R (t m) being scene objects point and the range difference of jammer to year machine platform, c is the light velocity.
Step 2: false large scene image is carried out piecemeal handle
Do not defocus condition according to depth of focus orientation and confirm distance to a minute module unit, distance to the piecemeal element length does Wherein, | y| be the distance to the piecemeal element length, λ is the radar signal wavelength, R sBe the vertical range of jammer to year machine platform, T aBe to carry the synthetic aperture time of machine antenna, v is for carrying a motor speeds, with the large scene image distance to total length divided by distance to the piecemeal element length, obtain apart to the piecemeal number.
Confirm the orientation to a minute module unit according to the nyquist sampling law, element length does
Figure BSA00000745105900051
Wherein, | x| be the orientation to element length, λ is the radar signal wavelength, R sBe the vertical range of jammer to year machine platform, PRF is a pulse repetition rate, and v is for carrying a motor speeds; D is for carrying the length of real aperture of machine antenna; L is for carrying the length of synthetic aperture of machine antenna, with the large scene image orientation to total length divided by the orientation to the piecemeal element length, obtain the orientation to the piecemeal number.
The large scene image is divided into M * N piece subimage, wherein, M be the distance to the piecemeal number, N is that the orientation is to the piecemeal number.The geometric center of each subimage is set to focusing center separately, with the focusing center of each subimage as separately scene center.
Step 3: modulation intercepted signal
With the radar time domain time delayed signal in the step 1 the distance to making Fourier transform, obtain the frequency-region signal of false scene objects point:
s r ′ ( f r , t m ) = s r ( f r , t m ) Σ xy exp { j 2 π f r ( 2 xv ( t m ) t m c ( R s + y c ) - [ v ( t m ) ] 2 t m 2 c ( 1 ( R s + y c ) - 1 R s ) ) } σ ( x , y ) exp { - j 2 π f r ( 2 y c + x 2 c ( R s + y ) ) }
Wherein, s ' r(f r, t m) be the frequency-region signal of scene objects, f rBe frequency of distance, t mBe slow time, s r(f r, t m) being the radar frequency domain signal that jammer is intercepted and captured, (x y) is the reflection coefficient of false scene point to σ, and (x y) is scene objects point position, and exp representes the end of exponential function, and j is an imaginary unit, R sBe the vertical range of jammer to year machine platform, v (t m) for carrying motor speeds, c is the light velocity, y cBe subimage scene center ordinate.
In the frequency-region signal with false scene objects point, change the part that is determined by the instantaneous oblique distance between the amplitude of false scene image and false scene and the radar and be defined as the frequency domain modulation coefficient:
σ ( x , y ) exp { - j 2 π f r ( 2 y c + x 2 c ( R s + y ) ) } · exp { j 2 π f r ( 2 xv ( t m ) t m c ( R s + y c ) - [ v ( t m ) ] 2 t m 2 c ( 1 ( R s + y c ) - 1 R s ) ) }
Wherein, (x y) is the reflection coefficient of false scene point to σ, and (x y) is scene objects point position, and exp representes the end of exponential function, and j is an imaginary unit, f rBe frequency of distance, R sBe the vertical range of jammer to year machine platform, c is the light velocity, t mBe the slow time, v (t m) for carrying motor speeds, y cBe subimage scene center ordinate.
Subimage frequency domain modulation coefficient is divided in advance generates part and generate part in real time, generate part in advance and be meant, the part that determines with respect to the position of jammer and the distance of scene center relatively by false scene objects point in the frequency domain modulation coefficient; Generate in real time part and be meant, in the frequency domain modulation coefficient with the time part relevant slowly with the Texas tower kinematic parameter:
To generate in advance part at the enterprising row distance of same localizer unit to stack, the index of modulation that obtains after the distance stack generates part in advance:
Σ y σ ( x , y ) exp { - j 2 π f r ( 2 y c + x 2 c ( R s + y ) ) }
Wherein, ∑ is the summation symbol, and (x y) is scene objects point position, and (x y) is the reflection coefficient of false scene point to σ, and exp representes the end of exponential function, and j is an imaginary unit, f rBe frequency of distance, c is the light velocity, R sBe the vertical range of jammer to year machine platform.
Different localizer units is generated the index of modulation after part and the distance stack in real time generates part in advance and multiply each other, and in the orientation to superposeing:
Σ x exp { j 2 π f r ( 2 xv ( t m ) t m c ( R s + y c ) - [ v ( t m ) ] 2 t m 2 c ) ( 1 ( R s + y c ) - 1 R s ) }
Wherein, ∑ is the summation symbol, and exp representes the end of exponential function, and j is an imaginary unit, f rBe frequency of distance, (x y) is scene objects point position, v (t m) for carrying motor speeds, t mBe the slow time, c is the light velocity, R sBe the vertical range of jammer to year machine platform, y cBe subimage scene center ordinate, obtain the index of modulation of subimage.
Each subimage is carried out parallel computation, obtain the index of modulation of all subimages.With the index of modulation of all subimages add with, obtain coefficient after the frequency domain modulation.The distance by radar frequency-region signal that obtains in coefficient and the step 1 after the frequency domain modulation is multiplied each other, obtain modulating the back apart from frequency-region signal.
Step 4: generate the cheating interference signal
To modulate the back apart from frequency-region signal the distance to making inverse Fourier transform, obtain time domain cheating interference signal.
Step 5: transmit the cheating interference signal
With the cheating interference signal forwarding, the other side's radar obtains the cheating interference signal of real scene radar signal and the stack of time domain cheating interference signal.
Further specify below in conjunction with 2 pairs of effects of the present invention of accompanying drawing.
Emulation shown in the accompanying drawing 2 is carried out under MATLAB7.0 software, and the parameter of emulated data is following: radar is operated in X-band, and signal bandwidth is 180MHz; Pulse repetition rate 1.7KHz; Antenna phase center is 10500m to the oblique distance at scene center, and distance is to being 2048 points, and the orientation is to being 1024 points; SAR system works pattern is positive side-looking, and resolution is 1m * 1m.Large scene cheating interference image template is about 2Km * 1Km (2048 * 1024 point).Because there is kinematic error in the machine of carrying, utilizes the motion compensation process of estimating based on instantaneous frequency modulation rate that the SAR echo data is carried out envelope and phase compensation, and be carried out to picture through CS (Chirp Scaling) algorithm.
Fig. 2 (a) is the real scene imaging results figure of no cheating interference, and wherein, horizontal ordinate is a localizer unit; Ordinate is a range unit; Can see true atural object target image such as village, field and pond imaging results clearly, and this SAR image object degree of focus is good, contrast is higher.
The false scene that Fig. 2 (b) is is disturbed template, and wherein, horizontal ordinate is a localizer unit, and ordinate is a range unit, and this image is the high-resolution imaging result in certain city, can see false urban targets such as a large amount of buildings, court and road are arranged in the image very clearly.
Fig. 2 (c) is for existing the imaging results figure of cheating interference, and wherein, horizontal ordinate is a localizer unit, and ordinate is a range unit.Four angles can seeing image by Fig. 2 (c) are being covered by false target clearly; True atural object object deck such as village originally, field and pond has added false urban target such as building, court and road; And the false scene objects through after the imaging processing has good focusing property; Reach the effect of " mixing the spurious with the genuine ", obtained good large scene cheating interference effect.

Claims (6)

1. large scene SAR cheating interference implementation method may further comprise the steps:
(1) jammer is intercepted and captured radar signal
1a) jammer is intercepted and captured the radar time-domain signal, and with the radar time-domain signal of intercepting and capturing in distance to making Fourier transform, obtain the distance by radar frequency-region signal;
1b) the radar time-domain signal is made delay process, obtain radar time domain time delayed signal;
(2) false large scene image being carried out piecemeal handles
2a) confirm distance to the piecemeal element length to the condition that do not defocus according to the orientation of the depth of focus, with false large scene image distance to total length divided by distance to the piecemeal element length, obtain apart to the piecemeal number;
2b) confirm the orientation to the piecemeal element length according to the nyquist sampling law, with the large scene image orientation to total length divided by the orientation to the piecemeal element length, obtain the orientation to the piecemeal number;
2c) the large scene image is divided into M * N piece subimage, wherein, M be the distance to the piecemeal number, N is that the orientation is to the piecemeal number;
2d) geometric center of each subimage is set to focusing center separately, with the focusing center of each subimage as separately scene center;
(3) modulation intercepted signal
3a) with step 1b) in radar time domain time delayed signal the distance to making Fourier transform, obtain the frequency-region signal of false scene objects point;
3b) in the frequency-region signal with false scene objects point, change the part that is determined by the instantaneous oblique distance between the amplitude of false scene image and false scene and the radar and be defined as the frequency domain modulation coefficient;
3c) subimage frequency domain modulation coefficient is divided into generation part in advance and generates part in real time;
3d) will generate in advance part at the enterprising row distance of same localizer unit to stack, the index of modulation that obtains after the distance stack generates part in advance;
3e) different localizer units is generated in real time after part and the distance stack the index of modulation in advance the generating unit branch multiply each other, and in the orientation to superposeing, obtain the index of modulation of subimage;
3f) to each subimage while execution in step 3c), step 3d), step 3e) and carry out parallel computation, obtain the index of modulation of all subimages;
3g) with the index of modulation of all subimages add with, obtain coefficient after the frequency domain modulation;
3h) with coefficient after the frequency domain modulation and step 1a) in the distance by radar frequency-region signal that obtains multiply each other, obtain modulating the back apart from frequency-region signal;
(4) generate the cheating interference signal
To modulate the back apart from frequency-region signal the distance to making inverse Fourier transform, obtain time domain cheating interference signal;
(5) transmit the cheating interference signal
With the cheating interference signal forwarding, the other side's radar obtains the cheating interference signal of real scene radar signal and the stack of time domain cheating interference signal.
2. a kind of large scene SAR cheating interference implementation method according to claim 1 is characterized in that: step 1b) described delay process is meant the radar signal of intercepting and capturing is postponed
Figure FSA00000745105800021
Signal behind the individual time quantum, wherein, Δ R mFor scene objects point m and jammer to the range difference that carries machine platform, c is the light velocity.
3. a kind of large scene SAR cheating interference implementation method according to claim 1, it is characterized in that: step 2a) orientation of the said depth of focus to not defocusing condition is:
Figure FSA00000745105800022
Wherein, | y| be the distance to the piecemeal element length, λ is the radar signal wavelength, R sBe the vertical range of jammer to year machine platform, T aFor carrying the synthetic aperture time of machine antenna, v is for carrying motor speeds.
4. a kind of large scene SAR cheating interference implementation method according to claim 1, it is characterized in that: step 2b) described orientation to the piecemeal element length is: Wherein, | x| be the orientation to element length, λ is the radar signal wavelength, R sBe the vertical range of jammer to year machine platform, PRF is a pulse repetition rate, and v is for carrying a motor speeds, and D is for carrying the length of real aperture of machine antenna, and L is the length of synthetic aperture that carries the machine antenna.
5. a kind of large scene SAR cheating interference implementation method according to claim 1; It is characterized in that: step 3c) the described part that generates in advance is meant, in the frequency domain modulation coefficient by the instantaneous oblique distance variable quantity that with slow time have nothing to do of false scene objects point with respect to the distance decision of the position of jammer and scene center relatively.
6. a kind of large scene SAR cheating interference implementation method according to claim 1 is characterized in that: step 3c) described real-time generation part is meant, in the frequency domain modulation coefficient with the time part relevant slowly with the Texas tower kinematic parameter.
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